Transpiration pull or water tension in leaf is responsible for which one of the following methods of absorption of minerals by the plants from soil?

Options

A. Active absorption of minerals
B. Mass flow
C. Donnan eqilibrium
D. Ionic exchange

Answer

To solve the question regarding the role of transpiration pull or water tension in the absorption of minerals by plants, we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Transpiration Pull**:
- Transpiration pull refers to the process where water evaporates from the stomata of leaves, creating a negative pressure that pulls water and dissolved minerals from the roots up through the plant.

2. **Analyzing the Options**:
- **Option A: Active absorption of minerals**: This process requires energy (ATP) and can occur against the concentration gradient.
- **Option B: Mass flow**: This refers to the movement of fluids due to pressure differences, not specifically related to transpiration pull.
- **Option C: Donnan equilibrium**: This is a concept related to ion distribution across a membrane and does not directly involve transpiration.
- **Option D: Ion exchange**: This is a reversible process of exchanging ions, which is not directly linked to the transpiration pull.

3. **Identifying the Correct Answer**:
- Since transpiration pull creates a negative pressure that aids in the upward movement of water and minerals, it is closely related to the process of active absorption of minerals. However, the primary role of transpiration pull is more aligned with the movement of water and minerals through mass flow rather than active absorption.

4. **Conclusion**:
- The correct answer to the question is **Option B: Mass flow**. Transpiration pull facilitates the mass flow of water and dissolved minerals from the soil to the leaves.

### Final Answer:
**Mass flow (Option B)** is the correct answer as transpiration pull is responsible for the movement of water and minerals through the plant.